Electric fire alarm



Sept. 20, 1932. J DQWELL 1,878,120

ELECTRIC FIRE ALARM Filed July 20, 1928 i'h 'qfl. i l I l B 6 BY ATTORNEY Patented Sept. 20, 1932 UNITED STATES JASPER I. DOWELL, 0F MART, TEXAS ELECTRIC FIRE ALARM Application filed July 20, 1928. Serial No. 294,291.

should occur, the inflammable material will be consumed as well as the covering for the conductors so that the wires will contact and thus the circuit will be closed to the alarm to notify occupants of a building that the building is on fire.

Another object of the invention is to provide spring means for insuring the conductors contacting when the covering has been consumed.

This invention also consists in certain other features of construction and in the combination and arrangement of the several parts, to be hereinafter fully described, illustrated in the accompanying drawing and specifically pointed out in the appended claim.

In describing my invention in detail, reference will be had to the accompanying drawing wherein like characters denote like or corresponding parts throughout the several views, and in which Figure 1 is a perspective view of the invention.

Figure 2 is a diagrammatic view thereof.

" Figure 3 is a detail View showing how the conductors are twisted together and covered with the inflammable substance.

As shown in Figure 3, the conductors 1 and 2 are twisted together and they are given a coating 3 of inflammable substance, such as paraffin. The conductors are strung around the walls of a room adjacent the ceiling and are supported at the corners of the room by the pulleys 4, as shown in Figure 1. A spring 5 connects one end of one conductor with an end of the other conductor, the spring being insulated from the wires of the conductors and the other end of one conductor is connected to a battery B and the other conductor is connected to an alarm A which is connected with the opposite terminal of the battery by a conductor 6.

Thus it will be seen that the circuit to the alarm is not completed as the conductors are out of contact with each other, but if a fire should occur, the inflammable material would ignite and thus this material as well as the covering of the wires would be consumed so that the two wires would contact and thus the circuit would be completed and the alarm sounded. The spring 5 will exert a pull on the wires and thus insure their contacting when the inflammable substance and their coverings are consumed. If this spring was not used, there would be danger of the wires failing to contact, due to the residue of the covering material and inflammable material between them.

It will, of course, be understood that this system can be placed in each room of a build ing at any desired point therein, though I prefer to place it adjacent the ceiling around the walls of a room. The system can be also used exteriorly of the building.

It is thought from the foregoing descrip tion that the advantages and novel features of the invention will be readily apparent.

It is to be understood that changes may be made in the construction and in the combination and arrangement of the several parts, provided that such changes fall within the scope of the appended claim.

What I claim is In a circuit closing means, a plurality of spaced pulleys, a fusible casement circuitously trained over the pulleys, a normally open electric circuit having current wires reverselytrained in said casement and provided with spaced terminal contacts, and a spring engaged with the ends of the casement next to the terminal contacts and adapted to bring the latter together on the rupture of said casement.

In testimony whereof I afiix my signature.

JASPER I. DOWELL. 

